Documents are most commonly executed as simple contracts. A contract is made binding on the date that both parties intend that it is to come into effect, which is typically evidenced by both parties signing the agreement. There is no requirement for the signature to be witnessed. Simple contracts have a statutory limitation period of six years.
The number of calories in a food is a measure of how much potential energy that food possesses. A gram of carbohydrates has 4 calories, a gram of protein has 4 calories, and a gram of fat has 9 calories. Foods are a compilation of these three building blocks. So if you know how many carbohydrates, fats and proteins are in any given food, you know how many calories, or how much energy, that food contains.
It's easier to count the actual grams of carbs, because that's how they're listed on nutritional facts labels. Carbs typically contain four calories per gram, so if your recommended intake is 900 to 1300 calories, you'd divide that by four to arrive at 225 to 325 grams. According to the Dietary Guidelines, the actual carb consumption by most women is on the lower end of that range.